.topBook {
    background-color: white;
}

.topBook a {
    color: #254375;
}

.allBack {
    width: 100%;
    background-image: url(https://zhang0228.oss-cn-wulanchabu.aliyuncs.com/beijing.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}

.main {
    position: relative;
    width: 3840px;
    height: 2455px;
    margin: auto;
}

.biaoqian {
    position: absolute;
    top: 75px;
    left: 160px;
    font-size: 40px;
}

.box {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 350px;
    background-color: rgba(0, 0, 0, 0.1);
    width: 2204px;
    height: 1333px;
}
.all {
    display: flex;
    width: 2204px;
    height: 258px;
}
.l1,
.l2,
.l3,
.l4,
.l5,
.l6,
.l7 {
    flex: 1;
    text-align: center;
    line-height: 258px;
    font-size: 75px;
    background-color: #afbad7;
}
.l1 a,
.l2 a,
.l3 a,
.l4 a,
.l5 a,
.l6 a,
.l7 a {
    color: white;
}
.content {
    position: absolute;
    bottom: 0;
    width: 2204px;
    height: 1075px;
    overflow: auto;
}
.content li {
    position: relative;
    width: 2204px;
    height: 465px;
}
.con1 {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 140px;
    width: 238px;
    height: 292px;
    background-color: #c0c0c0;
} 
.con2 {
    position: absolute;
    left: 487px;
    top: 50%;
    transform: translateY(-50%);
    width: 1570px;
    height: 292;
    font-size: 65px;
}
